Mold for making concrete blocks.



PATENTED MAY 23,1905.

F. & 0. EGKHARD.

MOLD FOR MAKING GONORETE BLOCKS.

APPLICATION FILED HA3- 7, 1905.

UNITED STATES Patented May 23, 1905.

PATENT OFFICE.

MOLD FOR MAKING'CONCRETE BLOCKS.

SPECIFICATION forming part of Letters Patent No. 790,291, dated May 23,1905. Application filed March 7, 1905. Serial No, 248,943.

To all whom it may concern.

Be it known that we, FREDERICK EOKHARD and CHRISTIANE KHARD, citizens oftheUnited States, and residents of the city of StLLouis, Missouri, haveinvented certain new and useful Improvements in Molds for MakingGoncrete Blocks, of which the following is a specification containing afull, clear, and exact description, reference being had to theaccompanying drawings, forming a part hereof.

Our invention relates to molds for making concrete blocks; and itconsists of the novel features herein shown, described, and claimed.

The object of our invention is to provide improved mechanism for makingconcrete blocks, either hollow, solid, or reinforced, of any size,shape, or ornamentation. V

The further object is to provide such a machine with improved movableand detachable sides and end plates and an improvedhandle which willautomatically open, close, and lock the sides and end plates duringoperation.

In the drawings, Figure 1 is a perspective view of a machine embodyingour invention. Fig. 2 is a sectional side elevation. Fig. 3 is aperspective view of one of the end plates are also the end pieces 2.Said end pieces.

also have forwardly-projecting shoulders 7, which extend a distancebeyond the said flanges or ribs in order to form an additional brace.Near the upper edge of the end pieces are horizontal projecting rods orbolts 8. Additional rods or bolts 9 also project horizontally from theends of the end pieces ata point beneath the said rods or bolts 8. Theserods or bolts 8 and 9 are preferably of sufficient length to passentirely through the said end pieces. The said rods or bolts 8 and 9project outwardly-through the inclined cam-slots 4 of the said sidepieces.

The automatic handles 3 are located at oppoint adjacent to the outerends with a series of inclined cam-slots 11, terminating at their upperends in vertical locking-recesses 12. The series of cam-slots 11 in saidautomatic handles are provided for the purpose of making concrete blocksof various sizes. Said automatic handles are also provided adjacent totheir upper edges with suitable hand-holes 13. Bolts or rods 14 projectfrom the ends of the side plates 1 through the said inclined camslots11.

15 indicates the bottom of the mold, which is made use of in the usualmanner.

16 indicates downwardly and outwardly projecting lugs formed upon theside plates 1 at or adjacent to their lower edges, and said lugs areadapted to engage the edge of the .bottom 15 and hold the same inposition.

The operation is as follows: The usual cores are to be placed in themold when it is desired to make hollow blocks. The usualcombination-core (not shown) is to be used when it is desired to makeblocks with horizontal as well as vertical air-spaces. A number of othercommon appurtenances are to be used in connection with our improvedmold; but these need not be described herein, as their construction anduses are well known. The parts of the mold are of course to be assembledas shown in Fig. 1, and then the mold is to be filled with concrete andtamped in the usual manner. When it is desired to remove the block fromthe mold, the operator grasps the automatic handles 3 by means ofhand-holes 13 and pulls the same upwardly. The upward movement of saidautomatic handles causes the inclined walls of the cam-slots 11 in theautomatic handles to engage their rods 14, thereby spreading apart theopposite side plates 1 and separating the same from the concrete block,and as the upward movement of the said automatic handles is continuedthe said side plates will also be moved upwardly, thereby causing thewalls of their inclined camslots 4; to engage the bolt or rods 8 and 9of the end pieces 2 and forcing the said end pieces outwardly away fromthe concrete block. When the mold is again set down, the parts assumetheir normal positions with the bolts or rods 8, 9, and 14 in thelocking-recesses at the upper ends of the said inclined cam-slots andsaid locking-recesses securing the locking parts together until theautomatic handles are again elevated. When it is desired to make anarrower concrete block, the bolts or rods 14 are placed in an inner setof the inclined cam-slots 11.

What we claim is 1. A separable mold for making concrete blocks, havingmovable sides, provided with inclined cam-slots; end pieces providedwith rods which engage said inclined cam-slots; and handles havinginclined cam-slots for separating said sides from the block containedwithin the mold; substantially as specified.

2. A separable mold for making concrete blocks, having movable sides,provided with inclined cam-slots; end pieces provided with rods whichengage said inclined cam-slots; rods projecting fromthe ends of saidside pieces; and handles having inclined cam-slots, the walls of whichengage the rods of said side pieces; substantially as specified.

In testimony whereof we have signed our names to this specification inpresence of two subscribing witnesses.

FREDERICK ECKHARI). CHRISTIAN ECKHARD.

WVitnesses:

ALFRED A. EIOKS, Enw. M. I'IARRINGTON.

